Playpen for cats



FIG. 1 is a perspective view of the playpen for cats embodying the design of the present invention;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front end elevational view thereof; and,

FIG. 7 is a rear end elevational view thereof. 

The ornamental design for a playpen for cats, as shown and described. 